2003 Dodge Van A/C blower

The A/C blower only works on high but not on any of the other settings (low and medium). I checked to see if the A/C compressor is working and it clicks on the low and medium settings but the blower doesn't.

What can it be? I checked the fuse and front panel dial switch and they are working properly (I even took the front panel switch apart and cleaned it and put it back together but didn't make a difference).

Thanks,

~ James